Question

Find the distance between P1(3, –195°) and P2(–4, –94°) on the polar plane. Round your answer to the nearest thousandth.

Answer 1

P2(-4,-94°) can also be written a (4,94°)

Make a sketch to see that you have two straight lines with vertex at the origin of lenghts 3 and 4 with an angle of 79° between them.

by the cosine law:
(P1P2)^2 = 3^2 + 4^2 - 2(3)(4)cos 79°
= 20.42056
P1P2 = 4.519

Answer 2

Thanks, I am understanding now.